The sheriff and his nine men sank down on the grassy slope, gasping, outspent.

Until at last, outspent with energy, he draws a deep breath of exhaustion, and realizes that he is weariness itself.

Word Origin and History for outspent

outspend

v.

mid-15c., "to consume totally, use up," from out (adv.) + spend (v.). Meaning "to spend more than another or others" is from 1840. Related: Outspent; outspending. Outspent is attested from 1650s as "exhausted."